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I have used some regular Mobile off and on along Quaker State or Pennzoil for 30 years depending if it was on sale or not. No problems. One of the cars 1974 Ford Maverick bought new, uses no oil, 155K miles, some by 3 kids. No engine work except for tuneup, waterpump & carb rebuilding.
Although I use Mobile1 in all of my vehicles, I stand by my beliefs that if you change your oil on a regular basis with a name-brand oil, you will be fine.