Switching back to synth

[Audioquest]

1999 Hyundai Elantra 2.0L. Oil & filter changes every 3000kms (1875 mi). After the factory fill, it had 2 OCI's of synthetic, and since then, nothing but dino. Currently have 39,000kms on motor, and I'm thinking of switching back to full synth and going to a longer 6000km (3750 mi) OCI. Should I do an Autorx of the engine before switching to synth or do you believe my short OCI's on dino should have kept my engine relatively clean?

 

[haley10]

I would just put in the syn and go from there. With your maintenance history, you should be fine without any flush or cleaning. 6K seems like a very short oci for a SYN. Why not go to 10K??

 

[Audioquest]

As you can see, I don't put a lot of miles on my vehicles (39000kms in 5 years is low), and a lot of it is city driving. So, I would only be changing my oil once a year with a 10000km OCI.

 

[haley10]

quote:

---

Originally posted by Audioquest: As you can see, I don't put a lot of miles on my vehicles (39000kms in 5 years is low), and a lot of it is city driving. So, I would only be changing my oil once a year with a 10000km OCI.

---

Ok, I see. I've heard Petro Canada puts out some really good, cheap GPIII syns up there. True?