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Yes there is a difference in minimum EPA spec and top tier gas. Many vehicles have rolled into our shop with dirty injectors causing a misfire or poor fuel economy. Most of them use min EPA spec gas like pioneer. I tell them to get mid grade petro canada gas and drive it. After two tanks the...

I've been toying with home brew oil spray formulas this year. My current blend is as follows: 1pt. Automatic trans fluid (penetrating agent) 1 "brick" paraffin (Approx. 1X2X4 inches) 1/2 cup roofing tar (to bind the oil) 1 1/2 qt. used 10W30 or whatever is around I use an old rice cooker to...

Addyguy, quick footnote, Volkswagen 2.0 engines pre-96 with high miles do better on 20W50. The oil pressure warning goes off frequently in hot weather if it runs 10W30. As for other vehicles, non-VVT engines are tolerant of viscosity switch-ups. Engines with any sort of variable valve timing...