A I’ll never understand why people ask this question. Are you trying to

save money? If this is the case, then consider the following information, and
then answer the question yourself. The oil filter is the storehouse for dirt in
the engine. Dirt, sludge, soot, and the likes produced in the crankcase
environment are filtered out of the oil and trapped in the filter. This dirt stays
in the filter until it is replaced. Why leave a dirty filter for another 3,000
miles? Why not remove it and restore a clean operating environment for the
engine? This will ensure longevity, proper oil pressure, reduced internal
wear, and reduced friction and heat, and thus increase the function and life of
the engine.

So, in case you did not get what I am saying here: Change the oil
filter every time you change the oil. It’s cheap engine insurance!

Tom

Tom,

Q I have used synthetic oil in my ‘05 Silverado from my third oil change

until my last oil change recently. I want to switch back to conventional oil at
this time. Will I have any problems with this move? The truck has about
83,000 miles.

Jim—Dallas

Jim,

A No, there will be no problem with switching back to conventional oil

(same viscosity as you are using). Just go to regular oil change intervals
every 3,000 to 5,000 miles, depending on how hard you work the truck.
Check your owner’s manual for severe and normal service recommendations
and follow that as a guide for oil change intervals because it is based on
using conventional oil.

Tom

Hello   Tom,

Q My wife purchased a BMW 335i in November of 2009. She pays close