Quote:
Originally Posted by RalliartRsX
PoorMans180SX
What would you recommend for oil for a trackday 350-400WHP SR20VET that sees temp swings (trackday temp swings) from 30-40F Ambient to circa 100F ambient. Clearances for the mains and rods are standard SR20 spec. Ring clearances are slightly larger than SR20 specs.
4-5 20 min lapping sessions a day per event.
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Amsoil Signature Series, Redline, or Motul 300V in 5w40 variety (Amsoil only has 0w40). Depending on how often you change it, you could use 0w40 in the colder months for sure. I like Redline the best, but that is personal preference. You can't go wrong with any of those. Motul Sport 5w40 is available for a great price on Amazon if budget is a concern, but you might want to consider mixing it with a quart or two of 300V to boost the additive package.
If you had opened up the rods a little you could do 5w50+ and have a little more load capacity, but C'est la vie.
Here's some valuable articles to read on clearance vs oil weight vs load capacity and such.
https://www.substech.com/dokuwiki/do...ngine_bearings
http://www.substech.com/dokuwiki/dok...ngine_bearings