E910 wrote:You can get thick & thin 5w-30. What brand are you using currently? The notion that as your car gets old it requires a thicker grade is a bit outdated. If it has been well maintained then you can keep using a slightly heavier version of the OE spec (5w-30 for the Altezza) for 200K km easy. Castrol Edge is one of the thicker 5w-30 around, this will be fine to use. I'm at 140K km & run Mobil1 5w-30 & the engine loves it. It's quite a bit thinner than Edge as well.
All stacky is doing with his uneducated use of 10w-40 semi syn is creating extra drag on the engine, reducing power & efficiency. The VVT doesn't work as well either (he'll run into problems with this later).
If you're serious about track days then look at using a synthetic 0w-40 or 5w-40 for real protection or splash out on a 5w-30 or 10w-30 designed for racing like Redline or Motul 300V.
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