Exhaust System
Upon removal of the heat exchangers, it was noted that there was a build-up of oil residue and grime on the insides of the heat exchanger jacket. The air which is heated within these jackets is routed to the cabin when heat is selected. To avoid the smell of hot oil, both heat exchangers were given a thorough cleaning with a water based degreaser.
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Right side heat exchanger.
The insides of the heat exchanger jacket was coated with oil and grime due to a leaking valve cover gasket and spilling of oil during topping up.
Note the clean inside of the heat exchanger jacket after using a water based degreaser.
Facto AT30 from Swish Maintenance is commercial grade water-based degreaser that I've been using since 1986. I haven't found a better product yet.