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(My battery is fine and the fuel injection system has been cleaned out) so Can using synthetic oil make the pathfinder sound like its is struggling when it is starting up?
 

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Synthetic motor oil is superior to dyno oil so it should provide smoother operation. Just make sure you're using the proper weight oil, like 5W30 or 10W30.
 

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I heard that the "thinner" nature of synthetic can magnify any pre-existing leakage problems.

Maybe it is struggling because it all leaked out? lol
 

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Synthetic motor oil is superior to dyno oil so it should provide smoother operation. Just make sure you're using the proper weight oil, like 5W30 or 10W30.
Agree. What weight did you use. Also, If you had any prior oil leaks, you need to fix prior to using any fully synthetic oil. Synthetics are much thinner than conventional.
 
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