Trying to gather clear data in which circumstance this sludge problem occurs.
This is for everyone who owns an RX300
please indicate if you have or had sludge problems or not

1. Year
2. AWD or FWD
3. oil change interval (2000 miles, 3000 miles, 5000 miles, never changed etc etc)
4. brand of oil (toyota, exxon, castrol etc etc)
5. viscosity of oil (10w-30 etc etc)
6. total miles
7. oil filter brand
8. did you perform the 30k 60k 90k 120k 150k or 180k mile service?
9. anything else you think we should know.

 

1. 2000
2. AWD
3. Oil change interval: religiously every 5,000 miles, serviced exclusively by dealer, lease car.
4. Brand of oil: Valvoline (dino)
5. Viscosity of oil: 5w-30
6. Total miles 68,000 - 3yrs, 4 mo. (extended 36 mo. lease to wait delivery of new RX 330.)
7. Lexus - changed every 5K
8. Did you perform the 30k 60k mile service? Yes, by dealer.
9. Other service: Replaced 1 O2 sensor at 44K, upgraded tires at 28K.
Oil pan dropped by dealer at trade-in, no sign of sludge. Mostly driven on freeways, No commuting, .some light off-road. 8 to 10 long trips - over 1000 miles. Some extended idling (1-2 hours while using vehicle as office on location). First trip within 21 days of delivery was 6,800 miles in 23 days.. NEVER a recorded problem.

 

NO sludge problems, evidence of or any other signs of it.

1. 1999
2. AWD
3. 3000 miles like a freaking religion
4. toyota
5. 10w-30
6. 103,000 miles
7. genuine lexus
8. 30k and 60k done at dealer 90k not done yet (i know, i know)
9. the last 30k miles was put on in just 14 months,
this is my commuter/beater,
A/F ratio sensor fixed using DIY method a few thousand miles ago

 

dmodem & LexusSexus might want to weigh in on this thread!

 

1. Year; both 99 and 03
2. AWD or FWD FWD
3. oil change interval (2000 miles, 3000 miles, 5000 miles, never changed etc etc) 5kmiles
4. brand of oil (toyota, exxon, castrol etc etc) Castrol Synthetic and Mobil1
5. viscosity of oil (10w-30 etc etc) 5W-30 as spec'd
6. total miles 50k on the '99 when sold and 21k on the '03
7. oil filter brand Toyota
8. did you perform the 30k 60k 90k 120k 150k or 180k mile service? yes all other normal services at dealer, self changes in between
9. anything else you think we should know. No. I will continue using synthetics in view of the potential issue about oil gell problems and the benefits of synthetic on general engine longevity, as I might just keep this baby a while.

 

1. Year-00
2. AWD or FWD-AWD
3. oil change interval (2000 miles, 3000 miles, 5000 miles, never changed etc etc)-4-8k (yes i know, i am very bad on oil changes with this car)
4. brand of oil (toyota, exxon, castrol etc etc) dont know what kind until last one, which I did myself. mobil 1 synth. USE to be petrol- never cleaned out before switch
5. viscosity of oil (10w-30 etc etc) - 5w30 i believe
6. total miles- 72k
7. oil filter brand- wix
8. did you perform the 30k 60k 90k 120k 150k or 180k mile service? - None that I know of
9. anything else you think we should know.- Car is leased. Havent really done any maintnence in the 4 years we have owned it. It is going back this July.


EDIT_ no sludge

 

1. Year; 2000
2. AWD or FWD AWD
3. oil change interval (2000 miles, 3000 miles, 5000 miles, never changed etc etc) 5kmiles
4. brand of oil (toyota, exxon, castrol etc etc) Dino switched to Mobil1 at 37k
5. viscosity of oil (10w-30 etc etc) 5W-30
6. total miles 60,000
7. oil filter brand Toyota
8. did you perform the 30k 60k 90k 120k 150k or 180k mile service? yes all other normal services at dealer, self changes in between
9. anything else you think we should know. K&N Filter at 37k. Nothing but oil changes, new front brake pads and tire rotation since I got it at 37k. D Drive Indicator light out.

 

1.1999
2.AWD
3.5000 miles
4.Lexus dealer
5.Lexus dealer
6.70,000
7. Lexus dealer
8. Serviced at all recommended intervals through 60,000
9. Cars runs like a charm, dependable, etc. did have transmission changed at 68,000 under warranty. Dealer has serviced car regularly and looks for problems which they have taken care of under warranty. No complaints.

 

No oil gelling or sludge problem.

1. Year - 2002
2. AWD or FWD - AWD
3. oil change interval - 5,000 miles or 4 months, whichever comes first
4. brand of oil (toyota, exxon, castrol etc etc) - Whatever dino oil Toyota and Lexus use
5. viscosity of oil (10w-30 etc etc) - 5W30 dino
6. total miles - 38,000+ miles
7. oil filter brand - Toyota
8. did you perform the 30k 60k 90k 120k 150k or 180k mile service? 30K done at Lexus
9. anything else you think we should know - Don't believe everything you read on the 'Net

 

1. 2001
2. FWD
3. Every 5000 miles since I bought it. CPO with 27.000.
4. Mobile 1
5. 5W-30
6. 51.000
7. Motorcraft
8. All service up to date. Done By Lexus or local Toyota dealer
9. A few minor problems. Rear lift shocks. Clicking noise from sunroof. Engine belts squeal when cold. Ash tray door broke. All fixed by Lexus.

 

1. 1999
2. AWD
3. 2,500 miles (I live in a high altitude area, 7,000 feet with a lot of hills)
4. Mobil 1 exclusively
5. Most of the first year and a half, 15W-50, later 5W-30, now a 5W-50, once a 10W-30.
6. 86,000
7. K&N
8. Perfomed all services roughly 5,000 miles ahead of schedule
9. We have checked under the valve cover several times, and it is clean as a whistle. With each oil change, I use Liqui Moly Engine Flush, and have used Restore (the oil additive, not the injector cleaner)

No sludge.

 

delete this

 

at how many miles was your sludge problem discovered?