Go Back   Club Lexus Forums > Lexus Model Forums > RX Models > RX - First Generation
Sign in using an external account
Register Forgot Password?

rx300 gas mileage

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 08-26-12, 01:59 PM   #1
Gizmo54
Driver School Candidate
Trader Score: (0)
 
Join Date: Jun 2012
Location: TN
Posts: 2
Default rx300 gas mileage

I read in this forum about thinner oil. I have only had my 1999 rx300 for 2 months now. It was posted that a thinner oil would help, so I tried it. Our rx300 is running cooler and quiter now. Our mpg has increased by 2 mpg than what it was before.
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!
Gizmo54 is offline   Reply With Quote
Old 08-26-12, 02:10 PM   #2
Lexmex
Super Moderator
Trader Score: (0)
 
Lexmex's Avatar
 
Join Date: Apr 2004
Location: Miami, Florida
Posts: 16,379
Default

Quote:
Originally Posted by Gizmo54 View Post
I read in this forum about thinner oil. I have only had my 1999 rx300 for 2 months now. It was posted that a thinner oil would help, so I tried it. Our rx300 is running cooler and quiter now. Our mpg has increased by 2 mpg than what it was before.
Welcome to the Club.

What brand and weight of oil is it?
__________________
Homepage of my 1999 RX300 AWD
Lexmex is offline   Reply With Quote
Old 08-26-12, 04:36 PM   #3
hypervish
Lexus Champion
Trader Score: (0)
 
hypervish's Avatar
 
Join Date: Aug 2009
Location: NJ
Posts: 4,635
lexusvishal
Default

Welcome to Club Lexus!

I have hard time justifying a 2 mpg increase just by changing to a lighter weight oil. Have you changed your driving habits?

It is true that a lighter oil can improve fuel economy, but 2 mpg just sounds like a lot.

And, running quieter could be a placebo effect. What do you mean by running cooler?

BTW: I don't mean to question your honesty, I'm just trying to find out more by asking questions.
__________________
hypervish is offline   Reply With Quote
Old 08-29-12, 04:37 PM   #4
Gizmo54
Driver School Candidate
Trader Score: (0)
 
Join Date: Jun 2012
Location: TN
Posts: 2
Default Gas mileage answer

I went to the Mobil 1 site and read for about two hours on all of their info. Again let us remind you that this was the first time we had changed the oil. We are not sure what oil was in it at that time. We also put a K & N air filter in even though the one in it looked new.
I have hard time justifying a 2 mpg increase just by changing to a lighter weight oil. Have you changed your driving habits?

It is true that a lighter oil can improve fuel economy, but 2 mpg just sounds like a lot.

And, running quieter could be a placebo effect. What do you mean by running cooler?

BTW: I don't mean to question your honesty, I'm just trying to find out more by asking questions.[/QUOTE]
Gizmo54 is offline   Reply With Quote
Old 08-29-12, 05:06 PM   #5
hypervish
Lexus Champion
Trader Score: (0)
 
hypervish's Avatar
 
Join Date: Aug 2009
Location: NJ
Posts: 4,635
lexusvishal
Default

Be careful using a K&N Filter. If you oil it too much, the oil will end up on your MAF sensor and set a CEL.
__________________
hypervish is offline   Reply With Quote
Old 08-30-12, 06:52 AM   #6
lexus114
Lexus Champion
Trader Score: (0)
 
lexus114's Avatar
 
Join Date: Aug 2007
Location: Bethlehem Twsp. Pennsylvania
Posts: 3,941
Default

Quote:
Originally Posted by hypervish View Post
Be careful using a K&N Filter. If you oil it too much, the oil will end up on your MAF sensor and set a CEL.

Yup, what my pal said ^^^^^^^ only oil the side that gets the dirt. BTW, re; the thinner oil. I ran Pennzoil Platinum 5W-20 earlier this year, and I could not believe the difference! It had more pep, and better gas millage. But, it had a bad thump in the drive train at low speed going in to a certain gear. (after letting off the gas, and giving it gas again) It`s like the added cushion of oil was not there. Plus my valve`s were kinda noisy as well. I have to admit though, I may put it in again. Oh, and the vvt-i didnt seem to kick in on the 20 weight oil either. But everything else the op mentioned, I can assure you is true.
__________________
2015 RX 350 AWD

2012 Mercedes-Benz C300 4 Matic Sport Sedan (wife`s car)

Last edited by lexus114; 08-30-12 at 06:57 AM..
lexus114 is offline   Reply With Quote
Old 08-30-12, 07:15 AM   #7
hypervish
Lexus Champion
Trader Score: (0)
 
hypervish's Avatar
 
Join Date: Aug 2009
Location: NJ
Posts: 4,635
lexusvishal
Default

Quote:
Originally Posted by lexus114 View Post
Yup, what my pal said ^^^^^^^ only oil the side that gets the dirt. BTW, re; the thinner oil. I ran Pennzoil Platinum 5W-20 earlier this year, and I could not believe the difference! It had more pep, and better gas millage. But, it had a bad thump in the drive train at low speed going in to a certain gear. (after letting off the gas, and giving it gas again) It`s like the added cushion of oil was not there. Plus my valve`s were kinda noisy as well. I have to admit though, I may put it in again. Oh, and the vvt-i didnt seem to kick in on the 20 weight oil either. But everything else the op mentioned, I can assure you is true.
How much of an mpg gain did you get?

I may have to give it a shot. I just did an oil change though with PU 5W-30.

BTW: you buy a new Benz?
__________________
hypervish is offline   Reply With Quote
Old 08-30-12, 07:47 AM   #8
lexus114
Lexus Champion
Trader Score: (0)
 
lexus114's Avatar
 
Join Date: Aug 2007
Location: Bethlehem Twsp. Pennsylvania
Posts: 3,941
Default

Quote:
Originally Posted by hypervish View Post
1) How much of an mpg gain did you get?

I may have to give it a shot. I just did an oil change though with PU 5W-30.

2) BTW: you buy a new Benz?


Well # 1 about 2mpg`s highway, and approx. 1mpg city.

# 2 yes........
__________________
2015 RX 350 AWD

2012 Mercedes-Benz C300 4 Matic Sport Sedan (wife`s car)
lexus114 is offline   Reply With Quote
Old 08-30-12, 07:58 AM   #9
hypervish
Lexus Champion
Trader Score: (0)
 
hypervish's Avatar
 
Join Date: Aug 2009
Location: NJ
Posts: 4,635
lexusvishal
Default

Quote:
Originally Posted by lexus114 View Post
Well # 1 about 2mpg`s highway, and approx. 1mpg city.

# 2 yes........
Wow, 2mpg on the highway. I never would have thought an oil could improve mpg by that much. I think I may try it out on my next oil change.

Now, it's time to treat yourself to another car as well. Maybe a weekend toy.
__________________

Last edited by hypervish; 08-30-12 at 08:02 AM..
hypervish is offline   Reply With Quote
Old 08-30-12, 08:01 AM   #10
hypervish
Lexus Champion
Trader Score: (0)
 
hypervish's Avatar
 
Join Date: Aug 2009
Location: NJ
Posts: 4,635
lexusvishal
Default

Quote:
Originally Posted by Gizmo54 View Post
I went to the Mobil 1 site and read for about two hours on all of their info. Again let us remind you that this was the first time we had changed the oil. We are not sure what oil was in it at that time. We also put a K & N air filter in even though the one in it looked new.
It seems as though 2 mpg extra is possible. Thanks for bringing this up.
__________________
hypervish is offline   Reply With Quote
Old 08-30-12, 08:20 AM   #11
lexus114
Lexus Champion
Trader Score: (0)
 
lexus114's Avatar
 
Join Date: Aug 2007
Location: Bethlehem Twsp. Pennsylvania
Posts: 3,941
Default

The only reason I know about the 2mpg increase, is because we go to Bedford,PA at least once a year. And the last run was with the 5W-20 oil in the sump. I couldnt believe it either! But it actually got it. Oh, and it pulled the hill`s in Western PA much better too.
__________________
2015 RX 350 AWD

2012 Mercedes-Benz C300 4 Matic Sport Sedan (wife`s car)

Last edited by lexus114; 08-30-12 at 08:36 AM..
lexus114 is offline   Reply With Quote
Old 09-02-12, 05:33 PM   #12
kalali
Pole Position
Trader Score: (0)
 
kalali's Avatar
 
Join Date: Oct 2009
Location: NJ
Posts: 220
Default

Not sure if 1-2 mpg gain/loss is much to get so excited about. First of all its within the measurement accuracy and secondly I can do much better than that by just a slight change in driving style. I'm willing to bet between the ethanol content and/or ambient temperature variation has more effect on gas mileage.
kalali is offline   Reply With Quote
Old 09-02-12, 05:38 PM   #13
hypervish
Lexus Champion
Trader Score: (0)
 
hypervish's Avatar
 
Join Date: Aug 2009
Location: NJ
Posts: 4,635
lexusvishal
Default

Quote:
Originally Posted by kalali View Post
Not sure if 1-2 mpg gain/loss is much to get so excited about. First of all its within the measurement accuracy and secondly I can do much better than that by just a slight change in driving style. I'm willing to bet between the ethanol content and/or ambient temperature variation has more effect on gas mileage.
I can do much better as well by changing my driving style, I can beat the EPA rating without even trying. But the point of this was to emphasize the fact that a thinner oil improved mpg by 2 miles.

Of course ethanol is the biggest variation on gas mileage. There is 10% ethanol in pretty much every gas station, unless you find one from pure-gas.org.
__________________
hypervish is offline   Reply With Quote
Old 09-02-12, 05:38 PM
 
 
 
 
Reply

Tags
1999, 2002, 2004, awd, bad, cleaning, filter, gains, gas, kn, lexus, maf, mileage, rx300, sensor

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
New RX 300 Engine Using Oil stoutman RX - First Generation 13 09-12-14 06:14 PM
Winter Oil Weight? Alphaman19 Maintenance 4 02-03-14 07:37 PM
Facts about oil and what grade to choose RgSc Performance & Maintenance 23 10-07-13 06:39 AM
Interesting valve cover issue/leak bgross88 RX - First Generation 3 03-08-13 03:47 PM
2013 rx 350 fwd - mpg smd2972 RX - Third Generation 10 10-16-12 03:13 AM

All times are GMT -7. The time now is 03:12 AM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info