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Author Topic:   Which Royal Purple?
posted January 21, 2004 05:44 AM
I am pretty sure they prob make a 10w30 also so you could ask the parts guy about it or you could have him see if he could get the 15w40 that you had been running. Btwn the 5/30 and 10/40 id take the 10w40.

[This message has been edited by dirtbuster (edited January 21, 2004).]

posted January 21, 2004 10:17 AM
Royal Purple Motor Oils:

Multi-Grade Oils: 5W20, 5W30, 10W30, 10W40, 15W40, 20W50

Straight-Grade Oils: SAE 30, SAE 40, SAE 50

If you need a source to order this from, email me:

posted January 21, 2004 10:46 AM
I ran Royal Purple's Racing 21 in an alky last year with good results. It's considered a 5w30. Notable was that the oil pressure would dip enough to flash the warning light during low speed yellow-flag laps. However, oil temps improved by ~30 degrees.
I plan on using Racing 41 this season.

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