Re: Synthetic oil question
I ordered head gaskets by the half dozen for my older Spirit cars, since I owned two. I think I still have one in the garage somewhere! The spring of '07, I ordered a gasket for my old boat (5.7L Merc/GM) online since they were hard to find locally. Anyway, the idiots that mailed it, folded the gaskets in half so they could save on packaging! Ugh. Took me another three weeks before I got a replacement set - that weren't folded over!
Along with AutoRX, there's a product in a can (yes a can), called Restore. A few friends of mine have used it on vehicles in the past for years, and swear by it to boost compression back up toward OE levels. Still, the Restore looks like a thickened engine oil. At least it's a lot less than AutoRX, but at least I can say that ARX works better than a lot of engine cleaners I've tried, including the Amsoil one.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!