Quote:
Originally Posted by vyuen
I've wondered what the same engine in the celica requires as well and fundamentally it should be the same. That Lotus specifies a slightly heavier weight oil maybe due to the higher engine temps since our engine is mounted midship and there is less cooling.
I believe only the Exige S comes with dual oil coolers as standard spec (other than maybe the new supercharged elise).
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The specified oil for a single engine can vary with intended use, with a change in redline rpm, or for other reasons. If you bought a GT3 version of the Exige with 270HP, Lotus might well recommend a 20W-50 instead of 5W-40 to minimize engine wear, and recommend oil changes every 500 miles. Put the same engine in a Corolla, and now fuel economy, desired service interval, and other factors may dictate a 5W-30 that gets changed every 7500 miles. That's one of the reasons it's hard to say any one weight is the optimal or perfect weight for an engine, or even a particular car. That said, Lotus seems particularly likely to make a sound recommendation based on the engine and type of car, and although I use an unusual oil I do buy a 5W-40 weight (at least during warranty).
John