In the past, there have been similar shifts in preferred engine oil viscosity grades. An example is the transition in heavy duty diesel engine oils in the 1980s from monograde viscosity SAE 30 and ...
The Family Handyman on MSN9d
What Oil Does My Car Need in Winter?
Colder temperatures can change how well motor oil keeps your engine running. You may need to change the oil to maintain a smooth ride all winter.
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