is gm 10w30 detergent oil??

[Carguy80]

i read this on the interesting articles section:
motor oil myths and facts

Filter Change Interval
Back in the days of 3000 mile oil changes many manufacturers recommended filter changes only half as often because the filter did not become clogged with dirt at only 3000 miles. This was good advice back then, especially because with non-detergent motor oils a lot of the sludge remained stuck to internal engine parts rather than being carried in the oil to the filter. Nowadays the filter should be changed at every oil change. There are some people who believe so much in synthetic oil that they change filters without changing the oil. There's no harm in changing the filter without changing the oil, but there is no point in doing this.

so oil what i use is gm goodwrench sl/sj 10w30 oil,is it a detergent oil that helps clean the engine?i change it every 3000miles with new filter.my owners manual says to change it evey other oil change,but i changed evey oil change.

 

[zrxkawboy]

Yes, it is.

 

[Blue99]

Generally, non-detergent oils can only be found in straight weights. Any API service grade later than SC (from the 1960's) will contain detergent & anti-wear additives.

Typically the non-detergent oils are labeled SAE 30 ND for non-detergent or have an API SA service grade designation.

In the garage, I have a bottle of SAE 30 ND that is used to fill oil cans and a bottle of SAE 10W for cutting chainsaw guide bar oil in cold temperatures.

 

[Carguy80]

so if detergent oils,like gm conventional 10w30 can they be able to remove sludge and deposits from the engine if it is changed every 3000miles? or,are synthetics oils only be able to do that? i still try to decide if i should use conventional or synthetic blends...

 

[Ray H]

No. The best you can hope for is that the detergent quality will prevent the formation of sludge and varnish deposits if you change the oil and filter out at recommended intervals. Already established deposits will need more than oil, even synthetics, to remove them.

 

[Carguy80]

so can conventional oil form sludge and deposits even if i changed every 3000miles? could someone please tell me how sludge and deposits are formed,and how i can i remove them from my engine? can exessive idling cause sludge or deposits?
how i can find out if my engine has sludge and/or deposits?

 

[m2200b]

Pull a valve cover or look in your oil fill hole.
You can use a diesel conventional or synthetic and have more cleaning agents available than conventional has if you can get close enough to the weight you want. You'd want diesel dino that is rated for cars also.

If you got the previous owners service book you can guess how well he did maintenance. If previous owner used a 40w it's a little more likely to need cleaning from additive residue.
I thought the car had some OIC with semi syn.

YOu still would be better off with AutoRX which can help your rings along with cleaning and if it cleans your rings you'll feel it. If its doesn't do much cleaning, that good news as it means a good clean engine already.

 

[Ray H]

Excessive idling - particularly in COLD climates - will definitely contribute to fuel dilution which, in turn, will materially contribute to sludge and varnish formation. I've used nothing but conventional oils for over 44 years of driving. When I popped the valve cover off my previous car, a '96 Honda Accord I4, to adjust the valves, the top end was completely free of any deposits, and the die-cast aluminum pieces were bright metallic with no color cast. I'm one of those laughed-at, pathetic old fogies who persists in the self-delusion that 3,000 mile oil and filter changes are ultimately beneficial. And apparently with good reason - the best maintenance is preventive maintenance.

 

[Carguy80]

what would you think that would be exessive idling 10-20min,perhaps?