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Wow that is clean. Would idling a lot possibly cause varnish? I almost never idle vehicles for anything longer than a traffic light stop.

2001 Honda CR-V 290k Out: SuperTech High Mileage Full Synthetic 5w30; Super Tech ST9688 In: Valvoline Restore and Protect 5w30; Super Tech ST9688 2007 Mazda 3 185k Out: Pennzoil Platinum 5w30; Fram CH9641 In: Valvoline Restore and Protect 5w30; OEM filter

I only cleaned the mating surface of the valve cover and spark tube seals. Did not touch anything else other than maybe wiping away some dirt that fell in. Didn't even check valve clearances.

I expected the same and was a little shocked to see the amount of varnish present. I wonder if it has anything to do with the 1 other owner the car had. That looks fantastic. I've been following the Valvoline Restore and Protect thread closely but figured this is more a PP thread with how many...

2007 Mazda 3 2.3L with 180k miles. Ran Pennzoil Platinum 5w-20 under my ownership from 109k January 2018. No additional additives. OCI of 5k miles. Burns about 1 quart (a dipstick's worth) in 5k miles since first owned. Commute is about 60% highway, 15 miles. I switched to Pennzoil Platinum...