I was in a WalMart recently and there was no 15W50 Mobil 1 Synthetic.
No quarts and no 5 quart jug.

However, it is still available at Advance Auto down the street in inner
city Baltimore.  About $5.70 per quart and good for 10 k or more, maybe
it even says 15k on the bottle.

I don't know the answer to the question of the suitability of 5W50 for
the WBX.

Dennis Haynes will probably jump in and give us some info.

Sam

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Sam Walters
Baltimore, MD

89 Syncro GL, Zetec Inside
85 Westy Weekender
85 Mercedes Benz 300D Turbodiesel - to become veggie oil powered

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