Vavoline 5w20 with 5881 miles - 1997 Subaru Legacy

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146
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Southern California
If challinging your points and asking for more than just pure conjecture is "going off on a tangent" then what's point of these forums? I guess it's also entertaining to sit back and watch the plot unravel here. Keep it coming... popcorn
 
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3,610
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Ponte Vedra Beach, FL
You could try to mix the 5w20 with some Valvoline Synpower 5w40 for a synthetic blend. In that way you would use up the 5w20 for a longer OCI and not risk the wear problems associated with the VWB 5w20 and it's very weak add pack. Just a suggestion....that's what I would do if I was sitting on a stash of weak oil. Just mix the VWB with the Valvoline Synthetic Synpower in a 50/50 proportion. Same Family of Oils and SynPower, although not overpowering, should compliment the Dino and give you a nice blend.
 
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5,706
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WatUpDoc
Here's another question: What would a TAN number here indicate? Does anyone know if a TAN from a UOA could indicate a trending condition in the engine itself or is it just saying the oil is acidic? Is there any lingering acidity by allowing an oil to get so low on TBN(for however long it may be) that TAN grows at dangerous rates?
 
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