For those of you with COSTCO cards, Mobile 1 goes on sale about once every three months. A case of six quarts costs $28.00. That's under $4.75 a quart plus sales tax for those of you who have to pay that. Seems like mighty cheap insurance to me.
I have a 2001 5.4 SSV that I bought at auction from the Feds in 2005, right after its warranty had expired. It had 135,000 miles on it. Today it has 262,000 miles on it and I have never even had a trouble light except for "service soon." I've had a start up ticky-ticky since I bought it, but no oil leaks and it continues to run like a top. I live in rural mountainous Montana where temp fluctuations during my ownership have gone from -38° to +104. It has been one hell of a vehicle! Of course, being so far from shopping and only going once or twice a month, I have had little stop-and-go on the engine, which may be the reason it has lasted so long.
I loved this Expy so much I bought another one - a 2007 SSV also from the Feds. So now I have 2! LOL! Bought it in 2015 with 148,000 miles for $4400. This one, however, came from the Seattle area rather than the Montana area. Now with almost 180,000 miles on it I got an error code for O2 sensor so I replaced all four of them. The code came back again - Bank one, Sensor 1, I think. So I am suspecting a bad catalytic converter. But bought an extended warranty for it so feel lucky there as well.
Boy! Have I strayed off topic! I guess the point is, I run Mobile 1 exclusively and have had no major problems with either vehicle and love 'em to pieces!