I have a 97 camry 2.2L 5SFE engine with 98,000 miles that had a check engine light on, throwing a code that says ‘EGR Flow Insufficient’.  That usually means there’s a problem with the EGR valve, EGR modulator, or the EGR valve position sensor… What I did was pulled the vacuum line off of the EGR valve and squirted about 2 capfuls of MMO into the EGR valve, I did not dissemble the unit at all, using a 50mL plunger-type syringe, the kind you find at pharmacies.  I reset/erased the check engine light code, and after 500+ miles of driving, it never came back on!  Easily saved me hundreds of dollars in parts & labor!

Just wanted to share my story.

MMO FOR THE WIN!
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ok maybe you have another solution..my 87 toyota truck ran fine..but my dad always said would run better with mystery oil.. so i put some in with three qts oil and very little to my gas when i filled up..my truck is throwing out white smoke...i never had that problem before ...i have a 300 mile trip and dont know if i should take it or not....
should i change oil and get old stuff out and see or are my gaskets or head gasket going to be blown soon