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Synthetic oil after 100k

This is a discussion on Synthetic oil after 100k within the Internal Engine forums, part of the LSx Technical Help Section category; Is it ok to switch to synthetic after 100k miles. I have a new job where I drive to work ...

  1. #1
    Join Date
    Jun 2012

    Synthetic oil after 100k

    Is it ok to switch to synthetic after 100k miles. I have a new job where I drive to work an hour early way 70-100 mph so i am thinking of a better oil. And if I change over what should the change interval be?

  2. #2
    Member DarrenWS6's Avatar
    Join Date
    May 2015
    Blossburg, PA

    Silver Metallic
    2000 Trans Am WS6

    Perfectly fine to switch at any time. I run Amsoil 5w30 in my daily driver 2.2L. I do 5,000 - 6,000 intervals along with a tank of fuel system treatment ( Amsoil fuel system cleaner ). It's been a good 54,000 miles in 3 years with this combo.
    2000 Trans Am WS.6 M6

    SLP lid & bellow w/ K&N, GMMG catback w/ Corsa Clones, UMI SFC, UMI Adj. Panhard, Eibach prokit, Bilstein HDs, Nitto NT555s, skip shift elim, whiteface overlays, 20% tint, matte black decal/overlays

  3. #3
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Mansfield, PA

    Black & Blue
    '02 WS.6 / '07 Suburban

    I run full synthetic and quality filters on our DD's with a 7,500 mile change interval.

  4. #4
    Join Date
    Apr 2014
    Pennzoil platinum and fram ultra oil filter on my dd with 159k

  5. #5
    Junior Member
    Join Date
    Aug 2016
    I was skeptical because years ago I had a 1986 grand national and when I switched to Mobil 1 it started leaking oil like a sieve. If I was parked for a half hour I would have a 2 inch diameter spot under my car. For this reason I was a little bit hesitant, but my new (old) 58K LS1 had not been given an oil change in a little while due to the prior owner not driving her that much, so I dumped the Purolator filter and oil which didn't look bad for a mix of Castrol GTX and Castrol Magnetec 50/50 mix. I used the M1 oil filter and my pressure jumped 20 pounds at idle from roughly 20 to 40 PSI. No leaks so far but I probably only have about 10 to 15% of the oil synthetic. My friend says that everything is O-ringed on the engine and there shouldn't be any issues. In the next couple years I will slowly incorporate synth until I get to 100% synthetic but I'm still kind of concerned about a rear main seal leak. Good to see nobody's had a problem with an older vehicle switch to synthetic.

    Sent from my iPhone using Tapatalk

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