Originally Posted By: Clubber_Lang
Bill,
with that being said, which do you believe is the stouter oil?
I think Amsoil stating that to follow Toyota's OCI (5,000 miles MAX) tells a lot on how long should you go with the 1ZZFE.
Personally, I go 7-8k normally with conventional. BUT I do 90% highway with 10% city. And most of the time my highway is a few miles to get to it and then hour + at speed with another few miles to get to work.
If I was going to run a syn it would be either Quaker State or Pennzoil Platinum (not PU) mainly for price. The engine will last the same no matter what oil you use. Our engines are 5w30 recommended and that is what I'd run. 2006 they allowed 5w-20 with some changes incl more oil in the sump.
Timing chains DO affect the oil life. Do NOT listen to anyone who says that they run xx miles with x brand so its okay with YOUR engine. Different mfg of engines ARE DIFFERENT.
In the winter, I lower my OCI no matter what oil. SC does not get that cold I think.
If you do decide to run EP, make sure you get a used oil analysis with TBN.
I would NOT run it for that long no matter what marketing/warranty spew that was presented to me.
Go review my used oil analysis. There was a 9k run of a oil that is stated to run 25k and it was spent. There is NO way it could make 15k much less 25k in MY motor. And that was with 2 quarts of make up oil in a 4 quart sump!
Exactly what are you trying to achieve?
You should read this and re-ask the question.
Bill