So, is 5W-30 + 1qt. Lucas thicker or thinner overall than just using 10W-40 in Spring/Summer/Fall? I will gladly try it by itself.
And, in your opinion, is Lucas the best oil thickener, or what else do you like better?
Thanks for the info. On my last oil change (last week), I had a different oil shop try their "experimental" compression restoring formula (went into the current oil and circulated for 10 mins at 1500 rpm before draining).They put in Pennzoil high mileage 10W30. I wound up having to add about 4oz of Lucas to get the misfiring symptom to subside. It had come back. 4oz was enough, without risking too high of oil level.I will add about 4oz of Lucas every thankful of gasoline; that engine uses 1/2 qt. oil in between oil changes anyways- soThe Lucas top-off will keep the oil level full.1 quart of Lucas is cheap enough (if I buy it myself). Next summer, I may try using a 10W30/10W40 mix.
Thank you as well Tom.