Mixing oil types (5w-20 mixed with 10w-30)
My RV has the ford v-10 in it and I noticed today the oil is closer to the "low" level than the "full" level on the dip stick. I have a few quarts of 10w-30 (might be 5w-30) but I was going to top it ...
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If it isn't all the way to the add mark I wouldn't put a full quart in and I probably wouldn't add any oil until it needs a quart.
