140,000 miles
Check with the application catalogue of your choice of oil brand and you should find your car listed with the appropriate grade of synthetic oil.
There is a note of caution, especially with an engine that has already covered a fair mileage. Depending on the service history and the type of oil used in the past, the engine could be clean, slightly dirty or very dirty inside and changing to a high detergent oil if the engine is dirty could cause problems. Detergent oils scour the inside and cleans things and holds the dirt in suspension so it gets drained at the next oil change.
The trouble is, there is a limit to how much dirt the oil can hold and if that limit is reached mass dumping can happen - blocking filters and oilways.
It is a while since I encountered an engine that died of a thrombosis and the additive packs of oils have been improving all the time but the point should be considered...
SOURCE: burning a lot of oil
Hi:
A quart every 1000 miles is not unusual, but can get expensive if you are using synthetic oil. Have you always used that in this Jeep? Even though synthetic oil is of higher lubricating quality than conventional oil, it is still thinner, or has less viscousity than normal oil too. What this often means is that an older engine with slightly worn valve seals or some engine wear might consume more oil when you use synthetic. This is not a problem, really, as long as you keep tabs on your oil level.
If you want to experiment around, once it gets warmer out, you could try some 20w-50 oil and see if your oil consumption drops, or even try adding some Lucas Oil stabilizer to your next oil change. If this helps you know that part of your consumption is due to the thinner oil you were using.
SOURCE: want to use synthetic blend motor oil. Okay with 145K miles?
Some people would say no, some would say yes. Some, like me would say no. The choice is up to you. If you change your oil regularly, you should never have a problem with the bottom of your engine. Or the top either for that matter,. Some people get started with synthetic and never stop. I have heard pros and cons about it. I used before, and I use it in my bike. The stuff is slippery. The weight you chose is good for hot weather, winter time might call for 5w30. One of the bad things about it is, it doesn't break down like conventional oil. I don't know if that is good or bad. I'll let you decide. Hope this helps.
SOURCE: Should I be using synthetic
You can use whatever you want.
You were not ripped off. That would be Fraud (ripped off) charged for a service not performed
You excepted a pitchmans offer, to sell you something
Never go to any quick lube places
Read up on the horror stories on the web,as well as Fraud
Most people get the oil drain plug stripped,wrong fluid,in wrong places,your lucky, you can still drive it.
Educate yourself. You have an owners manual,you have on your oil fill cap or close by ,what oil to use,you can call or stop by a dealer and ask questions.
SOURCE: does a 100% synthetic oil
Brand makes no difference
Weight, should only be what your vehicle calls for---that should be on the oil filler cap
Nothing wrong with synthetic oils---wouldn't spend the money now,with 150K
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