r/Diesel

47K archived posts · Jun 2009 – Sep 2026

/r/Diesel: For Diesel Enthusiasts

r/Diesel

Welcome to /r/Diesel, reddit's home for everything about compression motors!

Created Jun 25, 2009

94KMembers (last snapshot)

47KArchived posts

Welcome to r/Diesel, reddit's home for everything about compression motors! All content related to diesels is welcome here.

Please read the subreddit policies before you post and comment.

Edit your own flair above so we know what you drive!

Rules & Guidelines:

All posts must be diesel-specific. If you are posting a picture of a vehicle or part of a vehicle that could also be from a gas-powered vehicle, provide context (rule 3) or consider posting to a more appropriate sub.
Be respectful to each other and keep it civil.
Please include some information (Year, model, modifications, likes, dislikes, etc) on it in the comments of your submitted pictures! It adds context, encourages discussion, and helps us to appreciate your submission more.
No image macros or memes, please visit r/truckmemes.
Don't spam the sub with youtube vids/channels or Instagram accounts. No blogspam or bots.
No posts or videos promoting any intentional "coal rolling" or similar type behavior. Let's continue to keep our community viewed in a positive and responsible regard.
No posts about vehicle purchasing advice, please post those questions to a more appropriate sub such as r/carbuying r/carbuyingadvice or one of the diesel truck subs listed below in the sidebar.

In the market for a diesel vehicle?	[Buying a Used Diesel] (http://www.dieselpowermag.com/features/trucks/0603dp_used_diesel_trucks/)
[Choosing your Diesel Pickup.] (http://www.dieselpowermag.com/tech/1212dp_buying_used/)
Cummins:	[5.9 Vs 6.7] (http://www.dieselpowermag.com/tech/dodge/0809dp_5_9l_vs_6_7l_cummins_diesel_engines/)
Powerstroke:	[Buying a used powerstroke] (http://powerstrokehelp.com/PSD_common/used_PSD/used_PSD.asp)
	[ Powerstroke Injector Testing] (https://www.swampsdiesel.com/files/7.3LInjectorDiagnostic.pdf)
	[Bulletproofing a 6.0] (http://www.powerstroke.org/forum/general-6-0l-discussion/204386-write-up-bullet-proofing-6-0l-psd.html)
Engine Diagnosis:	[Diesel Exhaust Color Diagnosis] (http://www.dieselbombers.com/general-diesel-related/53737-diesel-engine-smoke-color-what-means-what.html)
Choosing the right oil:	[Engine oil 101] (http://www.api.org/~/media/files/certification/engine-oil-diesel/publications/mom_guide_english_2013.pdf)

Read the Truth about [Cold Air Intakes] (http://www.billswebspace.com/AirFilterTest.htm) (or at least one mans project to get real lab data) before you go spend that $500....

Mod suggested subs:

Interested in learning about alternative fuels? Check out r/biofuels and r/biodiesel!
r/4BT
r/dieselcars

Banner image thanks to u/KnightStalker.

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