I agree with Mark M.  Stick with it.  It is not expensive, and gives you a chance to look around.  On my Subie 2.2 motor, I use synthetic; change every 5K.  When on a long roadtrip across USA, I might stretch that to 7K.  I actually love changing oil, makes me feel like a mechanic.  I buy all my oil at Walmart, the 5 quart jugs.  Cheap.

    On Wednesday, May 15, 2024 at 09:21:09 AM PDT, Mark McCulley <mark@markmcculley.com> wrote:  
 
 I say stick to your current 3-4K schedule. Conventional oil formulations have not radically changed and even with a  synthetic oil you would not want all that dirty oil circulating through your engine for so many miles.
 
-Mark

> On May 15, 2024, at 8:38 AM, Dan N <dn92610@gmail.com> wrote:
> 
> Hi All...
> 
> For a 2.1 WBX... 30+ years ago recommended oil change interval was 3K to 4K
> miles. Since oil quality/composition evolved, is it safe to do oil changes
> at 8K to 10K miles? This is using Conventional Oil (not Synthetic).
> 
> Thank you..
> 
> dan