Oil???

Royal Purple straight 30w is over $13.00 a quart here an my local NAPA store! Wow! Is there any real advantage of straight weight oil over the 15w40 I'm using now?
Short answer is NO
In reality the only real advantage is being thicker when cold it is less likely to leak out of seals & gaskets when cold
So for really old engines with oil slingers & no seals it does make a difference
Otherwise no reason to use strait 30 other than the price
 
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