How much do you save changing your own oil?
$47 a change on full synthetic, $845 over ten years at two a year. The first year saves nothing: the tools cost $95 and two changes save $94. The third change is where it turns. On conventional oil it is $27 a change and $445 a decade.
The example
An ordinary car that takes five quarts, done on ramps in a driveway. Shop and parts prices are ordinary 2026 figures; yours are on your last receipt.
| Full synthetic | Conventional | |
|---|---|---|
| Shop price | $85 | $55 |
| Parts: oil (5 qt) $28 / $18, filter $8, washer $2 | $38 | $28 |
| Saved per change | $47 | $27 |
| Tools, once: ramps $60, drain pan $15, filter wrench $12, funnel $8 | $95 | $95 |
What it saves, and when
| Full synthetic | Conventional | |
|---|---|---|
| Year one, two changes, tools bought | -$1 | -$41 |
| Change at which it breaks even | 3rd | 4th |
| Ten years, twenty changes | $845 | $445 |
| Your time, at 0.75 h a change, valued at | $63/h | $36/h |
Read that table twice
The first row is the one the “save hundreds” posts leave out. Two changes in year one save $94; the ramps, pan, wrench and funnel cost $95. Year one is -$1. It breaks even on the third change and every change after that is $47 in your pocket, but the first year is a wash, and on conventional oil it is a loss of $41.
Ten years is where the number gets real: $845 on synthetic, the price of a set of tires. On conventional it is $445, about half, because the shop’s markup on synthetic is most of the saving. If your car takes the cheap oil, the shop is not overcharging you by much.
The last row is the honest one. 0.75 hours of your Saturday for $47 is $63 an hour. That is a good hourly rate for most people and a bad one for some. It is also 0.75 hours you will not spend the first time, when it is more like two.
The honest recommendation
- Do it if you will still be doing it in year three. That is when the $95 of tools is paid off and the $47 a change starts being real. One change and a set of ramps in the garage is the most expensive oil change on the page.
- Do it on synthetic, not conventional, if you are doing it for the money. $47 a change against $27. The shop’s synthetic price is where the saving lives.
- Borrow the ramps for the first one. It removes most of the $95 from the first year and tells you whether you want to do it again before you own the equipment.
- Do not do it to save money if your time is already spoken for. At $63 an hour it is good pay for a Saturday. It is bad pay if the Saturday was the only one this month. The saving is real; so is the hour.
Where these numbers came from
Saved per change is the shop price minus the parts. Year one is two changes’ saving minus the one-time tools. Break-even is the tools divided by the per-change saving, rounded up to the next change. Ten years is twenty changes’ saving minus the tools, with no allowance for the tools wearing out, which they do not at this rate. The hourly figure is the per-change saving divided by 0.75 hours. Disposal is free at most parts stores and is not counted.
Forgenta tracks car maintenance as its own line beside the payment and the insurance, so the oil change goes in as a dated cost either way and the decade-long saving is visible as a number rather than a feeling.