Oil consumption — reduction and decoking

Tags: #engine-oil

High oil consumption after catalyst removal or at high mileage — reduction strategy. For high oil consumption (масложор), especially after catalytic-converter removal or on high-mileage engines, the community-reported approach has two parts: (1) Switch to a premium, low-burn oil — specifically VMPAVTO Motive SN/CF 5W-30 was reported to not darken and produce minimal consumption. (2) Decoking: pour roughly 0.5 liters of diesel fuel into the oil filler, drive 100-200 km, then do a complete oil change. Avoid Azelit (chemically attacks aluminum pistons) and Dimexid (damages plastic components) as decoking agents. At around 143,000 km, consider replacing valve-cover seals/gaskets if leakage is also present^{12345678910111213141516171819202122232425262728293031323334353637}. Conflict: community members disagree on Lukoil oil quality — some report recent Lukoil batches causing масложор, others report long-term trouble-free use of the same brand.

Engine decoking for ring seizure — Lavr kit procedure. Piston rings can commonly seize around the 200,000 km mark (sometimes earlier). One owner performed a decoking treatment using a Lavr kit (following the kit's instructions) at 50,000 km on a 2.0L engine, combined with an engine flush using a specialized oil and a switch to a different oil brand (ZIC mentioned). A compression check is recommended if oil consumption increases after decoking; short of a major overhaul, monitoring consumption and trying a different oil brand is a reasonable first step^{3839404142434445}. Conflict: oil consumption after catalyst removal is disputed — one owner at 208,000 km with the catalyst removed reports no oil consumption at all, while others report noticeable consumption under the same conditions, suggesting high engine-to-engine variance.

Mobil vs. Valvoline consumption comparison on a 237,000 km high-mileage engine. A concrete brand comparison on a high-mileage (237,000 km, 2017 model) X80: Mobil synthetic showed zero consumption over a full 10,000 km oil-change interval, while Valvoline (the brand in use at the time of the report) showed 300-500g per 10,000 km on primarily city/short-distance driving. Oil change interval used: 10,000 km. General takeaway consistent with the rest of this card: consumption rate increases with mileage and driving conditions, and brand choice measurably affects the numbers⁴⁶⁴⁷⁴⁸.

Second-hand purchase — no aggressive decoking needed; basic maintenance sufficient. A separate, more conservative data point for buyers of a used, lower-mileage car: one owner bought a second-hand X80 at 53,000 km with minimal service history, and the community recommendation was not to perform aggressive chemical decoking — focus on basic maintenance instead. Supporting evidence: a separate high-mileage engine at 195,000 km that never received any decoking treatment had not suffered oil-consumption or related issues. Oil flushes and checking gasket/seal (hermetic) integrity are described as more valuable interventions than intake/combustion-chamber cleaning products for a car without symptoms⁴⁹⁵⁰.

Media

Photo of VMPAVTO Motive oil packaging, recommended low-consumption brand

Photo of decoking product container (Azelit shown with warning about aluminum reactivity)

Additional photo of decoking product packaging

Follow-up photo related to the decoking/oil-consumption discussion

Related pages

• Engine oil — spec, viscosity, and brands
• AKPP fluid change — drain plug and filter
• Oil change procedure and filter options
• Fuel consumption factors and dashboard display
• D vs. S fuel consumption data

Sources

This page is compiled from 50 community messages. Every fact carries a numbered reference to its original author and message.

Last updated: 2026-07-24