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.

A: I would recommend using a simi-synthetic hi...

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?
Recommended services
Get a Quote

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: I'm looking to buy an 01 cobra but the guy selling it says there is a lifter problem. How serious is this and should I buy?

The lifter is not too much of a problem, but it could be costly to replace if you are having a technician replace it. You can try changing the engine oil and filter and running a oil treatment in the...

Q: Starting problem. Shutting off

I would have the carburetor rebuilt or replaced with a rebuilt unit. Gasoline turns to gum and varnish as it ages. Most likely the float valve is gummed up, preventing gas from entering the carb and onto the engine. A...

Q: Car Won't start

If you haven't checked all the fuses yet, I suggest checking fuse #26. It powers up the fuel injectors and the Powertrain Control Module (PCM). I'm also suspecting the crankshaft position sensor (CKP). That needs to be tested. Listen to...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.