No tommygunn it was running ok no noise at all,but after I race in the freeway the next morning start the noise.I will check other forums for reference and see what can I find,and yes this time the mechanic-in-a-bottle didn’t work ,but the MMO it’s a excellent product I’m still use it in my other trucks.thank you guys for all the tips and time.....

Oscar - 30 March 2011 05:42 PM

but after I race in the freeway the next morning start the noise.

ahh, that may explain the noise.  If you are racing the engine, you may need a heavier weight oil to compensate for the high temperatures during your racing of the engine.......and as previously mentioned, may be time for “mechanical” adjustments, etc....

I would never use MMO w/ 5w20, especially in a 380HP engine!

There isn’t anything wrong w/ 5w20 at all. Just remember though, 5w30 was the original grade for that engine and won’t hurt a thing.

Many times, people get a bit sensitive about MFG recommendations(5w20 was mostly a CAFE thing). I’m not saying run a 5w40 or anything, but if I owned a Lightning and raced it, I would use 5w30 with or without MMO.