I am surprised I have not found a FAQ on what I am about to ask. If it is a common question with a post addressing it feel free to point me to it. On a general search I did not find anything except an OCI chart.
I have a 1992 toyota camry. The book OCI is 3000. I see many sites saying with new oil technology the OCI can actually be much longer and the short interval myth is due to oil change shops wanting more business and pushing it. The idea is that if the original engineers who came up with the 3000 OCI back in 1992 could see the improvements in oil over 30 years they would recommend 5 to 7000 for the same engine using conventional oil. On the other side I see comments that keeping 3000 is a good idea because old engines can sludge up oil easier than new engines.
So, do the improvements in conventional oil since 1992 make a 7000 OCI what the engine designers would recommend now?
I have a 1992 toyota camry. The book OCI is 3000. I see many sites saying with new oil technology the OCI can actually be much longer and the short interval myth is due to oil change shops wanting more business and pushing it. The idea is that if the original engineers who came up with the 3000 OCI back in 1992 could see the improvements in oil over 30 years they would recommend 5 to 7000 for the same engine using conventional oil. On the other side I see comments that keeping 3000 is a good idea because old engines can sludge up oil easier than new engines.
So, do the improvements in conventional oil since 1992 make a 7000 OCI what the engine designers would recommend now?