Can you mix GL-4 with GL-5 gear oil.

tuxon64B to Mechanic Advice@gearhead.townEnglish · 1 year ago

After 20 years decided to do it “right”. Capacity calls for 2.3 qts but I was hoping 2 qts of Red Line MT90 was going to do it but came up a little short. Do I buy another quart of this expensive stuff, top it off with my leftover Mobil GL-5 or say close enough? I’d say option three is not really an option.

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