For example, one method involves mixing one or two quarts of synthetic oil with the regular oil when changing the oil and filter. ... No special care is needed for switching a fairly new and/or sludge-free engine over. ... We agree with the mechanics and recommend a more cautious approach: Change the synthetic engine oil four times less often than you would change petroleum oil, following the aquot;30anbsp;...
|Title||:||Cook's Car Care Guide|
|Author||:||Geoffrey B. Cook|