, I have a 1992 Bonnie 3800 that has recently started having fluctuating low pressure between 20 and 40 psi when idling and goes above 40 when I hit the gas and drive. On warmerer days 75+, Theres been times when the car will run rough and feels like it wants to stall. Also when Its runs that way, My coolant starts coming out of the resvior. I thought me car was over heating but me temp guage is reading fine.
Now I did have my Oil and oil filter change and I had put In 5w30! So Im getting a new oil change and filter change tomarrow. I read the forums and I see 5w30 Is a No No for old cars and those warm days. I had my last oil change done a month&1/2 ago and I started noticing it when the temps outside got above 55. I'm keeping my fingers crossed that this will take care of the problem.
Does Anyone see anything else it could be????? And what type of oil should I use for warmer days I live in Mn and its going to start getting hot!!
Should I try 10w40 15w40 or 20w40? Thank you for the help