I've been using Amsoil SS 5-30 for about 15years now w/ ford racing 820 filter...
What are you guy's running?
What are you guy's running?
5/20 Castrol gtx, bottle stp oil treatment ,820 filter
That's exactly what my father used to use.
I'd just used 10w30 GTX and call it a day. Took a 4.0 I-6 to 200,000 miles on that stuff and the engine was perfectly clean inside.
I'm just past double those miles ,I remember 200k I was worried ,,now I'm just amazedYeah most of the cars my parents had over the years had over 200k eventually. He was the GM of the garage at a Ford dealership for many years, and he used to swear by the STP oil treatment. Literally I gave him a case of it every year for Christmas for the family fleet. All we had was Fords. Ever. Some real cool ones too.
I myself, don't use STP stuff though.
In the regular cars/truck I use 5-30 Q-State Ultimate Durability. From the factory the F-250 6.8 V-10 calls for 5-20, the Focus calls for 5-20 and the Suburban calls for 0-20. They all get 5-30
The race car gets the Driven XP-5 20-50 semi synthetic.