Ceramic Paste vs O-Ring Lube for Fuel Injectors

[Michael_P]

I'll be replacing the fuel injectors later this week on our Mercedes 380SL with a 5.0 Euro engine. When ordering all the parts, one of the recommended parts was ceramic paste. When doing research as to why ceramic paste over o-ring lube, I really didn't come up with much as far as an answer goes. I have the ceramic paste and plan on using it, but when doing injectors on other cars, I have always used a lube other than ceramic paste. The original injectors are steel and the OE replacements are brass. There is an insulator between the manifold and the injector. These injectors are mechanical (K-Jetronic) and have no electrical connection. I was just wondering if ceramic paste was old school and other newer substances could be better.

 

[Kestas]

From poking around, it seems this ceramic paste resists washout and high temperatures, which makes sense. It also doubles as brake caliper grease. I think any compound that meets these criteria, and doesn't attack the o-rings would be a good choice.

I couldn't find what the base lubricant is, nor the ceramic filler used for the Mercedes/Febi ceramic paste.

 

[Trav]

Ceramic lube is best for those, it acts not only as a lube but an anti seize prevents then sticking making removal easier later, For rubber O rings WD40 is by far the best.

 

[andyd]

E 28s use diff lube. Very few ever needed attention. Bosch EFI is sooo much better than any carburettor. K-Jetronic was mechanical? Like the Kugelfischer?

I like German names Kugelfischer means kingfisher My favorite E 28 color is lach silber salmon silver

 

[Trav]

K-Jetronic is an old and complex electro/mechanical system. It uses pop nozzles each fed by a hard like from the distribution block instead of simple electric injectors with ecm controlled drivers.

 

[tcp71]

my 1987 Audi4000 had the K-jetronic system on the inline 5. Not great, but miles ahead of carbs at the time.