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1999 STS
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5 Posts
Discussion Starter #1
Hi guys I know this has been done a million times but I need to get some answers. I just purchased 99 sts with 143,000 and has been maintained well by previous owner. My mechanic said at next oil change I should use Mobil one Synthetic oil and have been reading a ton of good and bad things on this forum. I phoned a GM dealer and spoke to service advisor he said stick to what owners maintence manual is. Has anyone changed and had any problems???

Thanks
 

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'03 STS 122K, '01 STS 161K - 3/3/11
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671 Posts
If it aint broke, dont fix it!

The engine was designed for dino, so why put in synthetic? At the very least, you're asking for leaks.
 

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2005 Deville Base, 2004 Escalade AWD
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275 Posts
If it aint broke, dont fix it!

The engine was designed for dino, so why put in synthetic? At the very least, you're asking for leaks.
+1

Nice car. Go with the advice of the GM mechanic and refer to your owner's manual - use the vehicle's oil life monitor to determine change interval.
 

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1999 STS
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5 Posts
Discussion Starter #5
Thanks guys I will use Conventional dino oil as Manual calls for it.

Thanks STSS,kckranz and Ranger

Quaid99:thumbsup:
 

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95 Fleetwood Brougham / 01 DTS / 11 CTS Lux / 11 DTS Platinum
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7,085 Posts
I vote regular. Since the filter can't last as long as you expect the synth to then you still have to crawl under the car to change the filter.

Since it's been proven that the benefits of synth will only be reaped until after about a million miles or so I don't see the point in spending 4 times as much per qt.

As long as you run the proper weight oil it really just doesn't matter and in my opinion, synth oil is a huge marketing ploy
 
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