Vspec, 20W50 Full Synthetic motor oil. 200 liter drum
Vspec
#V130970102-200L
£2048.09£1843.28
Member£1740.88-15%
Oils & Chemicals
622 products
Engine oil, primary and gearbox fluid, brake fluid, cleaners and workshop chemicals — over 500 lines from Liqui Moly, Putoline, Eurol and Maxima. Worth knowing before you order: a Big Twin holds three separate oils — engine, primary chaincase and gearbox — and only Sportsters share the primary and gearbox fill, so a full fluid change is three products on most Harleys, not one. Air-cooled 45-degree twins run hot and mostly call for 20W-50, and the primary needs an oil the wet clutch can live with, which is why dedicated primary fluids exist instead of pouring in the engine leftovers. Around the bike itself: Loctite for the fasteners you never want backing out, Autosol for chrome that has gone dull, and corrosion protectants for anything ridden on salted British winter roads.
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Showing 1–48 of 622 OILS AND CHEMICALS
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Three holds, one wet clutch, and the shelf around them
Harley fluid questions generate more forum heat than any mechanical topic. The architecture underneath is simple, and once you know it, the shopping list writes itself.
Count your holds before you order
A Big Twin — Evo, Twin Cam or Milwaukee-Eight — has three separate oil compartments: engine, primary chaincase and gearbox. A Sportster has two: engine, plus one shared sump where primary, clutch and gearbox live together. That single fact decides the basket: a Softail fluid change is three products (engine oil, primary fluid and gear oil); a Sportster's is two. The eternal "one oil in all three holes" debate is genuinely two-sided — Harley approves its own synthetic for all three, and plenty of riders run dedicated fluids per hold for shift feel — but both camps agree on the one hard rule below.
The wet clutch rule that has no second opinion
The clutch runs submerged in the primary fluid, so whatever goes in that hold must be wet-clutch safe — a motorcycle oil with a JASO MA/MA2 rating, or a dedicated primary lubricant. Automotive "energy conserving" oils carry friction modifiers designed to make surfaces slip; put one in a primary and the clutch obliges. If a clutch started slipping right after a fluid change, the fluid is the first suspect, not the plates. It is the cheapest diagnosis in the shop.
Brake fluid: read the lid, not the year
Harleys crossed from silicone DOT 5 to glycol DOT 4 during the mid-2000s, and the two must never meet — mixing gels the fluid and swells seals. On any bike from that era, and any bike with unknown history, the master-cylinder lid is the ground truth for which fluid to buy. DOT 4 then wants a full flush every two years; it absorbs water from the day it is opened, which is also why a part-used bottle from the back of the garage is not a bargain.
The rest of the shelf, ranked by use
Liqui Moly, Putoline, Eurol and Maxima carry the fluids; the supporting cast below them earns its shelf space. Threadlocker — blue for serviced fasteners, red only for the ones you never want to meet again — prevents more breakdowns than most parts on this site. Grease belongs on ape-hanger cable ends and lever pivots every season. Our best seller in the whole section is Autosol metal polish, which says something true about Harley ownership. And one warning that saves paint: matte "Denim" finishes are ruined — permanently glossed in patches — by wax and silicone detailers. Plain soap and water, or a cleaner made for flat paint; nothing else touches it.
Common questions
What is the best oil for a Harley-Davidson?
Harley's own 360 Syn3 full synthetic is a safe no-argument choice for Milwaukee-Eight engines — it's approved for all three compartments (engine, primary, gearbox) in a single bottle. For engine oil specifically, Spectro Platinum and Motul 7100 at the correct viscosity are what most independent technicians reach for, and both save money over branded Harley oil without compromising protection. Whatever you choose, use JASO MA2-rated oil in the primary to protect the wet clutch.
Which oil viscosity suits UK winter riding on a Harley?
The factory specifies 20W-50 for most Milwaukee-Eight applications, but 10W-40 is the common UK winter pick — temperatures here rarely sit above 10°C for long stretches, and a lighter grade gets oil to the heads faster on cold starts. On an air-cooled V-twin that matters more than it does on a water-cooled engine. Check your service manual; a handful of M8 specs require 20W-50 exclusively.
How often should Harley engine oil be changed?
The factory interval for Milwaukee-Eight engines is 5,000 miles or annually — whichever comes first. In UK use with short runs, cold starts, and stop-start riding, many owners go to 3,000 miles or a spring-and-autumn schedule. The primary chaincase oil (a separate compartment on most Harleys) changes at the same interval and is the one most commonly skipped — don't leave it.
Read the full guide: Harley-Davidson Maintenance & Service Guide →