Re: oil detergant or non det.
The screen in the pickup is so important. I have one that is plugged with varnish. Clean the pan & replace the screen, you can tell if it's sludged. If so go non detergent. My brother & I Got a cheap Corvair did a "real good" oil change on the gunky motor, was toast in 3 days, shoulda stayed with recycled ND as was used to.
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