Skip the auto shop - Our mechanics make house calls

Q: Thinking about switching to synthetic oil.

asked by on

I have a 1997 jeep grand Cherokee 4.0L I6 and it sometimes has trouble starting in the winter. I'm thinking about switching to synthetic oil so that it flows through the engine better in hopes that it will help my problem. Even if it doesn't help that problem I know that synthetic oil is better for engine life then conventional oil. My main concern is that I'm not sure if it's safe to switch from convention oil to synthetic oil since the vehicle has been running on conventional oil for 20 years now. I would appreciate your thoughts on my issue, thank you.

My car has 181000 miles.
My car has an automatic transmission.

I would recommend using a simi-synthetic high mileage oil rather than straight synthetic. High mileage oils are designed to reduce friction and have extra additives embedded that assist in removing unwanted deposits. As far as the reason your engine struggles to start in the winter, I would first work through the three main starting problems. Battery, alternator, and starter. If you cannot perform this diagnosis yourself, I would enlist the assistance of a qualified mechanic.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Will not attempt to start. Engine has spark. Also noticed oil was in the intake tube.

Hi there. Check to see if the fuel injectors are working. You can back probe them with a digital meter and see if the voltage is being metered. If the injectors are working, then check the crankshaft position sensor and...

Q: Bad battery, compression clutch, and loose bearing. 2000 Saturn LS

Hey there, thanks for writing in about your 2000 Saturn LS. This sounds like you have a short somewhere in the electrical system. I would start by testing the power supply to each of the various components or first try...

Q: My car shakes when I decelerate on the highway.

Hey there. Thanks for writing in today in regards to your 2004 Jeep Grand Cherokee. I think the issue you're describing is not related to the differential. Most of the time, a vehicle shakes because of three specific items; problems...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.