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I'm going to try some HPL 5w-30 No VII in my CTS Vsport. Should I use the cleaner prior to a OCI or just jump straight into the full sump ? 85K on the clock, with M1 0w-40. The car is auto crossed couple times a year. In hot,humid south. But wife short trips it a lot. Usually 5k OCI. I think I...

Just bought a '14 Cadillac CTS Vsport sedan 3.6l Twin Turbo LF3...specs say use a Dexos1 5w-30 synthetic, my concerns: Turbo coking Heat Shearing out of grade I used PP 5w-30 with my prior '05 STS Northstar and it performed well. This car will be driven much harder. (grin factor) Would a...

I had the ATF fluid "flushed" at the dealer at 50k...approx 3 yrs ago. I'm fairly certain that they used a bulk dexIII Fluid. The car now has 85k and I want to go to a quality full synthetic low shear fluid. This vehicles ff was dexIII but GM has since said to use dexvi fluid. Amsoil lists ATF...

I've had bad start-up noise (>30sec)with this engine using OEM filter and now a P1. Since this filter sits upside down up by the intake area I'm guessing the ADBV is allowing the oil to seep out of the filter. Any filters with a better adbv that anyone has had good luck with? Thanks

Okay, I've got a '05 Cadillac Northstar that I had been running G05 in, but I changed it over to JD Cool GardII last year. Now I've bought a '09 Tacoma 6cyl. and a '10 Mazda 3 2.4L. The Mazda lists FL22 as the coolant which I "believe" to be about the same chemistry as the Toyota Pink...

Just bought a 2005 Cadillac STS with the 4.4L V8 and am thinking of using a mix of 6 quarts GC green 0w-30 and 2 quarts of Maxima Ultra 5w-40. The purpose of the the Maxima is for esther content and for FM contents...is this mix too light for this engine, and should I send a sample of said mix...