Switching back anf forth between Dino and Synthetic oil

Reply Subscribe

Thread Tools

Search this Thread

08-18-05, 04:42 AM

sktn77a

Lead Lap

Thread Starter

iTrader: (2)

Join Date: Oct 2002

Location: Chapel Hill, NC

Posts: 4,578

Likes: 8

Received 292 Likes on 257 Posts

Switching back anf forth between Dino and Synthetic oil

Yes, I've searched the FAQs! It says "once synthetic oil has been used, its best not to switch back to Dino oil". Anybody know why? (my daughter had the oil changed in her 99 RX300 yesterday and they put dino oil in it - it's had synthetic every time since the first oil change).

Thanks

Reply Like

08-18-05, 09:22 PM

koolaidman

Lexus Test Driver

Join Date: Jul 2005

Location: il

Posts: 1,015

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by sktn77a

synthetic oil and conventional oil dont mix well. they will separate. otherwise if u want to switch. make sure u keep using conventional oil. dont keep mixing syn then conventional. could cause problems

Reply Like

08-18-05, 11:12 PM

salimshah

Moderator

Join Date: Apr 2001

Location: Austin, TX

Posts: 15,258

Likes: 338

Received 991 Likes on 896 Posts

Myth is that rubber seals will swell up.

Fact or fiction?

If you cant mix, then why are belnds sold?

salim

Reply Like

08-19-05, 10:23 AM

chimchimm5

Driver School Candidate

Join Date: Aug 2005

Location: CA

Posts: 11

Likes: 0

Received 1 Like on 1 Post

Quote:

Originally Posted by salimshah

Myth is that rubber seals will swell up.

Fact or fiction?

If you cant mix, then why are belnds sold?

salim

Exactly what I'm wondering. What is a blend then?

I suspect the whole "don't mix" :"don't switch back and forth" thing is a myth. I wish somone could show conclusive evidence by someone who actually works in the business... and I DON'T mean Jiffy Lube or a dealer. I mean you're a chemical petroleum engineer for Valvoline or something.