Neither Monarks (2 died after about 1.5 years in S. CA good weather) nor Autolites (tips swelled on 2 within 6 months and I almost did not get them out) are considered good. See old threads on the Monarks.

Campions worked OK on my Volvo Car Diesel but the compression is really good on it as I did an overhaul on the short block. Injectors were also rebuilt so that means that what is going on in the combustion chamber is all within specs.

When what is going on in the combustion chamber is not with in specs it is hard on even bosch and beru glow plugs and their life is in general shortened. That includes the need for making sure the Carbon build up in the glow plug holes is cleaned out with a Reamer or one of the alternative methods that members have used.

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84 300D, 82 Volvo 244Gl Diesel