'95 Geo Prizm (Toyota Corolla): Use oil thickener or thicker oil? 181K miles (1.8 liter, 4-cylinder)
Last oil change, the shop used 1 full qt of Lucas Oil Treatment with Castrol high-mileage 5W-30, to mask the recent (cylinder #2 low compression) problem. Worked fine for 2000 miles, but then I had to add � quart more Lucas (top-off level). Mis-firing symptoms are cough/gag/tug that feels like a giant fish jerking the car- (mainly between 2500 and 3500 rpm, worst in �steady state� cruising.)
Questions: How thick/viscous is the Lucas making the oil?
When Winter hits, how hard will it be to start? (Michigan, USA: parking outside.)
Try 10W-30 or 10W-40 oil instead? (Lucas + high-mileage oil = a $60 oil change). Pennzoil or Valvoline better than Castrol? Other products better than Lucas?
Do I �customize� the blend to the different seasons?
I want to get 20K more miles (2-years) out of this car. Still gets 37mpg, I can't afford to replace now.
Thanks [email protected]