1988 244DL N/A 300k miles. I'm in sunny California, temps almost always between 40'F and 85'F. Front oil seals leaked a few months back, so I changed those without further leaks. Not sure if rear main leaks. Engine runs okay; oil trap was nearly clogged when I bought that car about 1 year ago.
FAQs recommend 5W-30 or 10W-30. What's the difference for my Volvo?
What brand and viscosity do you recommend?
I've read that some diesel motor oil has normal levels of zinc and lots of cleansers and is safe for gas engine cars. Is it a good idea to use that?
Here info about Mobil 1 ESP 5W-30; meets API SJ, emissions friendly, and 900 ppm zinc (same as engine motor oil)
https://mobiloil.com/en/motor-oils/mobil-1/mobil-1-esp
https://mobiloil.com/~/media/amer/us/pvl/files/pdfs/mobil-1-oil-product-specs-guide.pdf
Is high mileage good, now that I've replaced 3 of the 4 seals?
I've been using Mobil 1 and like it.
I'm also reading good things about Pennzoil Ultra Platinum and Platinum engine oil, which comes from natural gas. Any experience with this?
FAQs didn't say anything about engine flush, eg ATF, Seafoam, diesel motor oil. Any thoughts?
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